spi: sirf: enable RX_IO_DMA_INT interrupt

commit f2a08b404691ef3e7be6ce81c185335cfc68b6db upstream.

in spi interrupt handler, we need check RX_IO_DMA status to ensure
rx fifo have received the specify count data.

if not set, the while statement in spi isr function will keep loop,
at last, make the kernel hang.

[The code is actually there in the interrupt handler but apparently it
needs the interrupt unmasking so the handler sees the status -- broonie]

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
index 95ac276eaafe6ab7a6c1f6b82aede8bad00bdac0..1a5161336730137498443ad47b573ba1a0605dff 100644 (file)
--- a/drivers/spi/spi-sirf.c
+++ b/drivers/spi/spi-sirf.c
@@ -438,7 +438,8 @@ static void spi_sirfsoc_pio_transfer(struct spi_device *spi,
                        sspi->tx_word(sspi);
                writel(SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN |
                        SIRFSOC_SPI_TX_UFLOW_INT_EN |
-                       SIRFSOC_SPI_RX_OFLOW_INT_EN,
+                       SIRFSOC_SPI_RX_OFLOW_INT_EN |
+                       SIRFSOC_SPI_RX_IO_DMA_INT_EN,
                        sspi->base + SIRFSOC_SPI_INT_EN);
                writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN,
                        sspi->base + SIRFSOC_SPI_TX_RX_EN);